hopalong Posted October 22, 2008 Share Posted October 22, 2008 As in Who's bullet, what kind of MPH (miles per hour) and Balistic Co-efficient ect. Might try to roll my own to make them comparable to MIL-SPEC HOP Link to comment Share on other sites More sharing options...
busyhawk Posted October 22, 2008 Share Posted October 22, 2008 HOP, Ok, I have the specs from NAVSEA Warfare (Crane) which states: AA53, MK 262 MOD 1 ballastic charts: Sierra Bullet: .224 dea. 77 gr. HPBT MatchKing MK 12 SPR (18") velocity @ 3,000 FPS I am guessing you can get the Coefficients from Sierra. The load is pretty hot to say the least, I load a Nosler 77 gr. at 2,725 from my JP and it hits as hard as I want it to. If you load to the above FPS you might run into some wear to say the least for a three gun game. Hope this helps, Scott Link to comment Share on other sites More sharing options...
uscbigdawg Posted October 22, 2008 Share Posted October 22, 2008 Sam, 77gr. in 223, is most likely Sierra. Rich Link to comment Share on other sites More sharing options...
Derek45 Posted October 22, 2008 Share Posted October 22, 2008 (edited) Sierra 77 gr. HPBT MatchKing Ballistic Coefficient = .362 I load 'em up with VARGET, but I've never got 'em close to 3000fps. Edited October 23, 2008 by Derek45 Link to comment Share on other sites More sharing options...
Chris Posted October 22, 2008 Share Posted October 22, 2008 There is a thread on another forum about this with lots of info.. http://www.calguns.net/calgunforum/showthread.php?t=54716 Link to comment Share on other sites More sharing options...
uscbigdawg Posted October 23, 2008 Share Posted October 23, 2008 Cor-Bon lists their 77's at 2800. A much more realistic number IMHO. Rich Link to comment Share on other sites More sharing options...
Tom Freeman Posted October 23, 2008 Share Posted October 23, 2008 Fill the case up to the bottom of the neck or so, with Ramshot TAC. Some of the older lots of 262 had cannelured bullets. Not sure about current lots. Link to comment Share on other sites More sharing options...
benny hill Posted October 23, 2008 Share Posted October 23, 2008 Black hills out of a 18" is about 2700 fps. Link to comment Share on other sites More sharing options...
BPiatt Posted October 24, 2008 Share Posted October 24, 2008 I chrono'd a batch of the army's 77's and got 2780 fps out of my 20" barrel. I obtained the same velocity using Hogdgon's Benchmark powder. You'll have to work up your own powder charge as I can't remember what it was. Link to comment Share on other sites More sharing options...
sideshowbob Posted October 30, 2008 Share Posted October 30, 2008 "Some of the older lots of 262 had cannelured bullets." Two versions of the round have been procured to date. Initial production runs, designated Mark 262 Mod 0, lacked a cannelure. Subsequent production, designated Mk 262 Mod 1, added a cannelure to the bullet to improve seating in the cartridge case. Definitely Sierra. Link to comment Share on other sites More sharing options...
hopalong Posted October 31, 2008 Author Share Posted October 31, 2008 Thanks for the info so far. I managed to scarf up a box (20) of the real thing so I can now get some info with my rifle. Hop Link to comment Share on other sites More sharing options...
hopalong Posted November 16, 2008 Author Share Posted November 16, 2008 (edited) Update on the 77grn LC-LR (The real stuff) In MY Sabre Defence 18 inch it averaged 2653 MPH !!! At 200 yds with my 1x4 Leupold set at 4 and very good sandbags ect. I got a 1 1/2+ (but not quite 1 3/4) 5 shot group At 100 yds it shoots half an inch lower than my 55 grn stuff. At 200 it is pretty much the same point of impact as my 55 grn stuff. That is all I got to test today. Will do more before the big show at Benning. Hopalong Edit to add the 1 3/4 thing Edited November 16, 2008 by hopalong Link to comment Share on other sites More sharing options...
Long Range Posted November 23, 2008 Share Posted November 23, 2008 Update on the 77grn LC-LR (The real stuff)In MY Sabre Defence 18 inch it averaged 2653 MPH !!! Hopalong Wow! Your batch of LC 77 is doing 3892 FPS!!! (conversion rate of MPH to FPS is 1.467) I want a Sabre Defence barrel!!! Long Range Link to comment Share on other sites More sharing options...
hopalong Posted December 1, 2008 Author Share Posted December 1, 2008 With testing and some addition, subtraction, multiplication and division I came up with 22 inches high at 200yds is 0 at 500 yds. Sure hope those targets are painted a good different color than the background, as my 4x sure doesn't bring things close at much past 250 yds. Am glad they shoot well though. Hop Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now