165 gr VLD in .270 Winchester?

[COBrad]

Looking for a good bullet to reach the half-mile mark on Marmots this fall. The Matrix Ballistics bullet looks like my huckleberry. My rifle is a Cooper with a 10 twist barrel. Marshal, at Matrix, tells me this twist should work with this bullet, though a 9 twist is optional. Anyone have any experience with this bullet in this caliber? What kind of speed did you get?

[rscott5028]

As soon as I wrap up a couple of projects (2-3 weeks), I'm going to order some and start working up a load. I'd be very interested in exchanging load data.

thanks,
richard

[bigngreen]

It will be interesting to see how fast a 270 win will hump one of the 165's, it may be at that point where it's to heavy to take advantage of the BC due to low speed, a 140 -150 Berger VLD may be the ticket. My buddy has a herd of 270's and he has a couple 140 Berger loads to test and I'll give him a few of my 165's to get a feel for how they will do over the crony.

[COBrad]

bigngreen, keep us posted on the speed you get with this bullet. According to my ballistic software I can reduce wind drift by 6" at 1K if I can get 2800fps, and 5" at 2700, over the load I am using. I am currently getting 2975 with SMK's and their .488 BC.

[rscott5028]

Originally Posted by bigngreen

It will be interesting to see how fast a 270 win will hump one of the 165's, it may be at that point where it's to heavy to take advantage of the BC due to low speed, a 140 -150 Berger VLD may be the ticket. My buddy has a herd of 270's and he has a couple 140 Berger loads to test and I'll give him a few of my 165's to get a feel for how they will do over the crony.

You may be right. If nobody else is making 165's, there may be a reason.

I suppose the smaller bore will raise the pressure substantially. As such, I suppose the powder choice and barrel length would be critical.

This may be a great situation to model in Quick Load if someone has a full copy.

[Jinx-)]

I'm in process developing load using 150 gr NBT, it has 0.496 BC and 0.279 SD, so far I'm getting 0.5 - 0.7 MOA groups using RL-17, I'm still stepping up load. Berger on the other hand in 150 gr offer better BC 0.531 but SD is a bit less 0.272. The 165 gr bullet would be interesting to work with, but availability is scarce.

[COBrad]

I've looked at the Berger 150, but according to my ballistics software, there is little to be gained over the 135 gr SMK's I'm currently using. When I last emailed Matrix about availability of the 165's, two days ago, the guy said he had plenty on hand. Currently I'm getting ready to do load development with the 140 gr Accubond. I am hoping to come up with a load that will give me similar enough speed to use the same ballistics chart with both the SMK, .488 BC and this bullet with it's .496 BC. I am planning on getting a custom turret calibrated in yardage and think it would be great if it worked with both a varmint and elk load.