what's the heaviest cartridge for LTR .223?
- Thread starter sunnyside
- Start date
give it a try you it might work - as the twist on the Police LTRs is in 1-9", which can support bullets up to 70gr. If its not stabilized then you'll simply have poor accuracy and possibility of bullets hitting the target sideways. +
http://www.6mmbr.com/223Rem.html
From what the Remington web site says you have a 1:9 twist. Some 1:9's will shoot 80 gr bullets some won't, however they will shoot 75's gr bullets.
You will have no problems safely firing your rifle with heavy bullets, getting them to stabilize once you fire them may be another story. You won't know until you try.
You will have no problems safely firing your rifle with heavy bullets, getting them to stabilize once you fire them may be another story. You won't know until you try.
The heaviest "cartridge" you can use in your .223 Rem LTR is .223 Rem. The heaviest "bullet" on the other hand, can vary quite a bit. - dan
1-10" twist will support 70grain bullets so all the match 68-9grain bullets are definite go.
Barrel Twist Rate 1:14" 1:12" 1:9" 1:8" 1:7" or 1:6.5"
Max Bullet Weight: 55gr FB 65gr FB 73gr BT 80gr BT 90gr BT VLD
Stability
The stability of a bullet is a function of bullet wt, diameter (cal), velocity, bullet length and rifle twist, plus some atmospheric conditions that generally only matter if you are in an extreme environment.
Within practical limits the length in any given caliber is mostly related to the wt, however with some ballistic tip bullets, the length may be greater than can be accounted for by bullet wt alone (the plastic tip is less dense than lead).
The bottom line here is that may Rem700P with a 1:9 twist does a great job on bullets up to 73 gn, and an adequate job on SMK 77gn bullets, but it does not do well with 75gn Amax bullets as these are actually longer than the 77gn SMK's.
The stability of a bullet is a function of bullet wt, diameter (cal), velocity, bullet length and rifle twist, plus some atmospheric conditions that generally only matter if you are in an extreme environment.
Within practical limits the length in any given caliber is mostly related to the wt, however with some ballistic tip bullets, the length may be greater than can be accounted for by bullet wt alone (the plastic tip is less dense than lead).
The bottom line here is that may Rem700P with a 1:9 twist does a great job on bullets up to 73 gn, and an adequate job on SMK 77gn bullets, but it does not do well with 75gn Amax bullets as these are actually longer than the 77gn SMK's.
The number of Savage owners who successfully use the 75 gr Amax has led some to speculate that the Savage 1:9 twist is actually a tad bit tighter than the Remington 1:9. Or I wonder if it could be something else...
Anyway, while the 69 gr SMK is great fun in my rifle, I'd still like to test out the 77 gr SMKs I have, and also some 75 gr Amax.
I recently read an article where the author claimed the actual twist in these was 8.5. FWIW - dan
- Location
- Houston, TX
Have to disagree here, I had excellent results with the 75 AMAX in a Remington 700P with a 26" barrel, very accurate out at 800m. Returned it because it cratered the primers badly due to oversize firing pin hole in the bolt.
Eric
Eric
I think that the 75's are at the limit of stability, in a 1:9, my best groups after a month of load development were ~1inch compared to .25 for the 77's. Each rifle is different, and I assume once in a while a 1:9 may actually be a 1:8.5? My friend and I bought two (Rem700p;.223) from the same dealer at the same time, neither will shoot 75gn bullets very well!
Anyway, I am not suprised by what you find, each commercial rifle is often a bit different. Especially if they are made a few years apart.
