What BC numbers did you come up with on the 7mm 151g?
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Anyone using PVA Cayuga bullets?
- Thread starter Westernhuntr
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codyadams
Well-Known Member
When I ran it out to 1100, I had to drop it from .310 to .300 G7 for drops to lign up, so pretty dang close to advertised, different barrels or the vortex HST scope could make that difference.
Yep, thanks. Maybe you have this info posted elsewhere, but I'd be interested in the following info when you get a chance:
1) velocity on the 170g 7mm
2) barrel twist & length
3) freebore
4) powder & charge
5) seating (relative to pressure groove & lands)
6) photos: 151g beside 170g and loaded round
Sure appreciate the help. You are generous with your time on this forum.
codyadams
Well-Known Member
The .338 270 SBD expanded to .440, for more info reference this page -
Badlands Precision Bullets thread - From BC to terminal ballistics
Sounds outstanding to me. " CodyAdams", wish I were there to share your sucess.. Because of all the trees on the place I have two ranges. 108 & 424yds with a big deep canyon between me & the 424 yd target. Would love to have a 200 & 300 yd range , which I do have except I can't use it because...
codyadams
Well-Known Member
7 Sherman Max
1. I got up to 2980ish max with the 170
2. 7.5 twist, 20"
3. Standard, .205"
4. VV N-565, 70.0 grains max @ 2980, no more room for powder
5. Pressure groove is .125" off lands
6. 170 seating @.125" off -
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ADG 7mag brass is good stuff. 180s in my brother's rifle, never saw psi till 3120 w/ H1000. I know after 4 reloads it needs a Larry Willis collet die since the walls just ahead the belt have grown enough to give a lil resistance upon extraction.
Thank-You bud. Most helpful - and fast!
codyadams
Well-Known Member
I corrected my post - I am using N-565, not N-570. Sorry for the confusion
codyadams
Well-Known Member
Ya, I'm hoping I'm good, I didn't see any pressure signs appear until nearly 2 grains more powder, so I'm hoping I'm enough under to be in standard pressure ranges. I would think so, the bearing surface on these bullets is very short, even on the 170 it is shorter than the neck of the 7 max, and the centering ring is under bore diameter, so that adds very little resistance. These are on their 4th fireing now, and still extract like butter, however the brass has been used for load developement, not this load consistently.
Bghunter338
Well-Known Member
Is this on your 7mag or max?
codyadams
Well-Known Member
This is the 7 max, running 170's and a 7.5 twist. The 7 mag is using the 151's and an 8.5 twist. Sorry for the confusion ha ha
Bghunter338
Well-Known Member
No your good, I've been trying to keep up hahaha.
Bghunter338
Well-Known Member
I've got some 170's I might try out of my STW when she's done. It will have a 28" 7.5 twist. That's why I've been following along. And I might have my 7mag re-barreled.
