McGuire Ballistics 270 Heavy Copper Rose testing

[Idaho Trecker]

I'm glad I was finally able to test this bullet out for some terminal performance after doing so much bc and bullet performance testing. It was definitely luck that I was able to find a bear since I had one evening to escape and a drive out in the morning. The evening didn't turn up any bears but did find a canyon holding a good amount of mule deer that are going to be big this year! Unfortunately for me its a draw hunt and I can't put in the way idaho limits what you can put in for by species... that's another story.
Almost was able to test on a coyote but had everything strapped to my pack for once and wasn't able to get the gun off in time.
Driving out the next morning I was glancing down the canyons to look for a rock to shoot and much to my amazement I spotted a bear. For me this was strange because I almost never see bears other than evenings but that's probably just my limited bear experience. Luckily the excitement didn't wear off before my common sense because it ended up being 1400' vertical down to where the bear was. It was a perfect morning in every sense. No wind. Not hot. Not cold. I got down to 670 yards and decided to set up in case the bear decided to wrap around the corner I wouldn't have been able to get on it again. Ranged him a few times and felt good so let the 149 McGuire fly! Leaving the muzzle at a dull 3315 fps it got there in a hurry and did what it should have.
I hiked to the spot where the bear was hit and was a good amount of blood spray and know the bullet exited but wasn't able to find it. I was hoping to get lucky and find a disturbed spot in the dirt to search. The entrance was a little higher than I wanted but with the angle and trajectory the exit was mid section where I would have wanted. Luckily, for my back and legs, it was a small bear but was still an adventure I'll remember. The exit was just over an inch in diameter it looked like and being a smaller bear there wasn't a lot of width the bullet passed through or resistance so seeing that kind of exit was great in my opinion.
Got it skinned out and packed back up the 1400' with the extra weight. Somehow from start to finish I made the whole trip down and back in 4 hours. I felt the effects of that for the next 3 days though.
I'll be using this combo more in the fall to test some more on animals if all things work out. All in all I'm very impressed with this bullet.

Entry

Exit

Slightly steep canyons

 

[JAYgs8163]

I'm glad I was finally able to test this bullet out for some terminal performance after doing so much bc and bullet performance testing. It was definitely luck that I was able to find a bear since I had one evening to escape and a drive out in the morning. The evening didn't turn up any bears but did find a canyon holding a good amount of mule deer that are going to be big this year! Unfortunately for me its a draw hunt and I can't put in the way idaho limits what you can put in for by species... that's another story.
Almost was able to test on a coyote but had everything strapped to my pack for once and wasn't able to get the gun off in time.
Driving out the next morning I was glancing down the canyons to look for a rock to shoot and much to my amazement I spotted a bear. For me this was strange because I almost never see bears other than evenings but that's probably just my limited bear experience. Luckily the excitement didn't wear off before my common sense because it ended up being 1400' vertical down to where the bear was. It was a perfect morning in every sense. No wind. Not hot. Not cold. I got down to 670 yards and decided to set up in case the bear decided to wrap around the corner I wouldn't have been able to get on it again. Ranged him a few times and felt good so let the 149 McGuire fly! Leaving the muzzle at a dull 3315 fps it got there in a hurry and did what it should have.
I hiked to the spot where the bear was hit and was a good amount of blood spray and know the bullet exited but wasn't able to find it. I was hoping to get lucky and find a disturbed spot in the dirt to search. The entrance was a little higher than I wanted but with the angle and trajectory the exit was mid section where I would have wanted. Luckily, for my back and legs, it was a small bear but was still an adventure I'll remember. The exit was just over an inch in diameter it looked like and being a smaller bear there wasn't a lot of width the bullet passed through or resistance so seeing that kind of exit was great in my opinion.
Got it skinned out and packed back up the 1400' with the extra weight. Somehow from start to finish I made the whole trip down and back in 4 hours. I felt the effects of that for the next 3 days though.
I'll be using this combo more in the fall to test some more on animals if all things work out. All in all I'm very impressed with this bullet.
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Entry
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Exit
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Slightly steep canyons
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Excellent

 

[K.E.C. Darkside]

CONGRATULATIONS.
And Nice Shot.
Good for you.

 

[fordy]

Gday Idaho tracker
Congrats first off & great description thankyou

what was the impact velocity & did this shot take out spine or if not how close to it was the pills path as reaction was very good
if i missed it apologises in advance

Cheers

 

[Idaho Trecker]

Gday Idaho tracker
Congrats first off & great description thankyou

what was the impact velocity & did this shot take out spine or if not how close to it was the pills path as reaction was very good
if i missed it apologises in advance

Cheers

I actually took a screenshot of my AB while up there so I had that information for later. The impact velocity was 2466 fps and still had 2013 ft lbs at the 670 yards.

Unfortunately I didn't dig around in it. I made that mistake one time and will not do it again. I can do a lot but the amount of tape worms squirming around in bear insides is my kryptonite
I dont think it actually hit the spine and was an inch or two low of it. Not saying the hydrostatic shock or fragments didn't damage/break it as well.

 

[fordy]

Gday Idaho tracker
Thanks for the information on below

I actually took a screenshot of my AB while up there so I had that information for later. The impact velocity was 2466 fps and still had 2013 ft lbs at the 670 yards.

Unfortunately I didn't dig around in it. I made that mistake one time and will not do it again. I can do a lot but the amount of tape worms squirming around in bear insides is my kryptonite
I dont think it actually hit the spine and was an inch or two low of it. Not saying the hydrostatic shock or fragments didn't damage/break it as well.

I'm one that doesn't like the cns shots for analysis of a pill & while not 100% it not one I'll doubt you on your assessment of it as I've seen enough on a few of Sam's pills ( not this caliber) that a few of them give that temporary wound channel that's definitely capable ( have seen it ) of producing enough spine shock to do that

I've enjoyed reading this thread & your journey so please keep it coming

Cheers

 

[onpoint]

Great job Ryan!!!

 

[Idaho Trecker]

I'll be headed north next week for a day or two and try to find a second bear to test the 27 SM and the copper rose on. If that pans out I'll update this.

Today's update is the start of load development with the 148cr in a 270 Sherman Mega with a 1:7.5 twist 22". The rifle is a Paradigm build with a zermatt ti medium action. Started off by breaking in the barrel while fire forming a 100 pieces of brass. As of now I've only been able to run a pressure test with Retumbo. A couple things that are going to be different than what I'm use to is being restricted on the magazine length. The chamber is perfect for this bullet but the mag is forcing me to jump them around .130".
Did 1 grain increments to see if I could hit pressure but never did as I ran out if capacity having to seat the bullets deep.
66. 2752
67. 2803
68. 2846
69. 2885
70. 2944
71. 2984
72. 3043
73. 3072
Had paper at 100 yards which doesn't tell near as much as some real distance but it was windy and I was short on time. The last 3 shots seemed to come together quite nice though. Might explore a group in that window and hope I get lucky as I'll take some luck haha
If it doesn't work out with Retumbo then might have to go to a bit faster burn rate and see what happens.

 

[fordy]

Gday Idaho tracker
Looking good & best of luck
Cheers

 

[Idaho Trecker]

Decided to ditch work early today and couldn't help myself... instead of being productive and doing stuff I need to i did what i wanted to do. Loaded up a pressure test with n565, rl 26, and a 3 round string with retumbo for a group based off of my pressure test.

The retumbo test was not good at all. The first 2 shots with retumbo were 1 fps different but the third opened up to an es of 22 fps. Might come togeter with seating depth change but im moving on. N565 was not as you'd expect based on the target as far as charge to impact point. And rl 26 was impressive for just 3 rounds fired. Both pressure tests were 1 grain increments.
N565 hit pressure at my max charge of 70 grains... I think. I've never worked with a zermatt action so im going by bolt lift only since the ejector is fixed in the action. The primers looked good throughout however. 565 maxed out at 3041 fps.
Rl 26 maxed out at 3102 fps and the target was impressive for a 3 grain spread. The other thing i was impressed with was the ammo was ambient temp of 82 degrees outside and no issues with rl 26. I've personally never experienced the problems others have with the pressure spikes but this is the hottest temp I'll shoot in anyway.

L to R
Retumbo, n565, RL 26

 

[Idaho Trecker]

Since last time I've updated this thread I've settled on rl 26 with these single feed. The load I have stuck with has given me 3025fps average over 15 or so rounds and 30 degrees temp difference. Es has been single digits as well. It also put up this group at 432 yards. Definitely impressed with bullet and rifle.


And just because here is a picture of the 270 mega L and 27 SM R with the 148.

 

[MT-JONAS]

Phenomenal shooting and results!

 

[Idaho Trecker]

Finally got another test subject for the 27 Sherman Mag and the 148 McGuire. Early season antlerless hunt finally paid off and was able to get my wife set up for a 360 yard shot. Only took one starting out at 3300 fps and is pretty gentle on the ears and shoulder with the Unknown Suppressor OG-L with the brake. It was crazy because I thought she had missed after hearing what sounded like a ricochet. The bullet passed through two feet of elk and still had enough to hit the water deprived dirt and make a little zing.

I was filming but I guess our wires got crossed so I didnt get the shot recorded which I'm really bummed about. Impact velocity was 2810 fps and 2613 Ft Lbs. She ran 50-60 yards and piled up while the other 50 or so head of elk ran off. She kicked for a couple seconds and that was the end for her. Shot was perfect with the cow slightly quartering it destroyed the lungs as it went and opened more as it went through.
Entrance:

Exit:

In the middle:

On a side note:
I'm more impressed with this combo than I was with my 33 nosler and 250 berger EH last fall on my bull. I didnt like the way the berger seemed to open on impact it seemed. I could almost put my entire fist into the entrance side of the ribs with the two shots only a couple inches apart on the bull. Distance was almost the same granted starting speed was way different and bullet construction. I'll be getting some 225 or 250 McGuires for the 33 Nosler this fall.