Fiftydriver
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Re: 50 Allen Tactical, Initial velocity test results...
Norhman,
Did a bit of range testing and load development with the 750 gr A-Max. Accuracy wise, the rifle is amazing. At 100 yards it was consistantly playing with sub 1/2 moa three shot groups for four different groups.
Problem is that is about all I can muster without developing a severe flinch. I will say this is the most dramatic recoiling rifle I have shot. Not fun at all. At this time I am developing a new muzzle brake which should dramatically reduce the felt recoil on this rifle to comfortable levels. Right now they are far from that!!!
Performance wise, I am already happy and still have alot more performance to get out of the case. I started with Rl-22 and loaded it up until I simply could not get any more powder in the case. THis top load averaged right around 2350 fps and absolutely zero pressure signs. The pressure is so low in fact that even after 4 firings on a case, I still only have to neck size and the cases chamber like they are not even there.
I am very excited to test some quicker burning powders. I am looking at H-4350 really hard as that may be THE powder for this round, offering full pressure loads(65,000 to 68,000 psi) with 100% load density.
I predict this round will easily hit 2450 fps with the 750 gr bullet with the right powder and possibly even push 2500 fps with top end loads.
Still, just have to get the bullets over the chrony, but first for my well being, I need to machine up that new brake and get it fitted. The brake on it now is one of Shawn Carlocks DE 4 port brakes that are 1.000" in diameter. Just not enough surface area when you open them up to a 0.530" bore for much recoil reduction. Not the fault of the brake design in any way, just not the right application for this round. This is a relatively high expansion ratio round so I need alot more surface area on that brake to reduce felt recoil.
My new design will start with 2" diameter 416 stainless barrel stock. Will bore and thread it for the muzzle threads and then will machine at least four partition style ports into the bar stock. These will probably be 3/8" wide by around 0.900" tall. I will then mill the top and bottom of the brake flat to help appearance.
I have played around with the idea of angling the ports back and will look at this more as well as this would also increase the effectiveness of the brake but dramatically complicate the milling process.
Either way, there will be a hell of alot more brake on it here soon and there will be no more testing until the new brake is on the rifle!! /ubbthreads/images/graemlins/grin.gif
Its a good thing the Super Sniper has a good rubber pad on the eyepiece. I got racked between the eyes so hard on one of those shots it almost splade me out behind the shooting platform!!
I am not sure what I expected trying to match standard 50 BMG match performance in a 15 lb class rifle. There will be some level of recoil!!! /ubbthreads/images/graemlins/grin.gif /ubbthreads/images/graemlins/grin.gif
Working to correct that though.
Kirby Allen(50)
Norhman,
Did a bit of range testing and load development with the 750 gr A-Max. Accuracy wise, the rifle is amazing. At 100 yards it was consistantly playing with sub 1/2 moa three shot groups for four different groups.
Problem is that is about all I can muster without developing a severe flinch. I will say this is the most dramatic recoiling rifle I have shot. Not fun at all. At this time I am developing a new muzzle brake which should dramatically reduce the felt recoil on this rifle to comfortable levels. Right now they are far from that!!!
Performance wise, I am already happy and still have alot more performance to get out of the case. I started with Rl-22 and loaded it up until I simply could not get any more powder in the case. THis top load averaged right around 2350 fps and absolutely zero pressure signs. The pressure is so low in fact that even after 4 firings on a case, I still only have to neck size and the cases chamber like they are not even there.
I am very excited to test some quicker burning powders. I am looking at H-4350 really hard as that may be THE powder for this round, offering full pressure loads(65,000 to 68,000 psi) with 100% load density.
I predict this round will easily hit 2450 fps with the 750 gr bullet with the right powder and possibly even push 2500 fps with top end loads.
Still, just have to get the bullets over the chrony, but first for my well being, I need to machine up that new brake and get it fitted. The brake on it now is one of Shawn Carlocks DE 4 port brakes that are 1.000" in diameter. Just not enough surface area when you open them up to a 0.530" bore for much recoil reduction. Not the fault of the brake design in any way, just not the right application for this round. This is a relatively high expansion ratio round so I need alot more surface area on that brake to reduce felt recoil.
My new design will start with 2" diameter 416 stainless barrel stock. Will bore and thread it for the muzzle threads and then will machine at least four partition style ports into the bar stock. These will probably be 3/8" wide by around 0.900" tall. I will then mill the top and bottom of the brake flat to help appearance.
I have played around with the idea of angling the ports back and will look at this more as well as this would also increase the effectiveness of the brake but dramatically complicate the milling process.
Either way, there will be a hell of alot more brake on it here soon and there will be no more testing until the new brake is on the rifle!! /ubbthreads/images/graemlins/grin.gif
Its a good thing the Super Sniper has a good rubber pad on the eyepiece. I got racked between the eyes so hard on one of those shots it almost splade me out behind the shooting platform!!
I am not sure what I expected trying to match standard 50 BMG match performance in a 15 lb class rifle. There will be some level of recoil!!! /ubbthreads/images/graemlins/grin.gif /ubbthreads/images/graemlins/grin.gif
Working to correct that though.
Kirby Allen(50)
