Home Forums Hunting & Shooting Hunter's Campfire 270AR SPR (New AR-15 cartridge coming this fall)

According to Mule Deer's 1/4 rule, the 270 SPR should be capable of around 200 fps increase at similar pressure levels compared to the 6.8 SPC. This is using the case capacity figures you quoted.

According to Hodgdon 6.8 data, a 110 Vmax is capable of 2690 fps with a 24" barrel (with 30 grains of IMR 8208) . Conservatively estimating a 15 fps loss per inch, that will be around 2610 with an 18" barrel at similar pressure levels.

So if your round is capable of a 200 fps increase, we are looking at just over 2800 fps with 110s at similar pressure levels.

This is if everything goes according to plan. The increase in case capacity may bump up the best powder choice into a slower bracket, and IMR 8208 may not be ideal. In face, I'm betting it will be on the fast side when it comes to 130 grain bullets, but that's just a postulation.

Today- 18" barrel
37gr CFE223, not max pressure. 110gr HPBT=2855fps chrono did not read above 37gr. 40gr was not max pressure.
37gr CFE223, not max pressure. 120gr SST=2736
39gr CFE223, Max pressure 120gr SST=2860 primer starting to flatten, no cratering.
38gr CFE223, 130gr Berger=2692fps-no signs of pressure.

Just a swag here, the 110s should hit 3000 or close, 120s as shown 2850-2900 and the 130s 2750-2800 out of a 20".
85gr TSX 3300???

38gr CFE223, 130gr Berger=2692fps-no signs of pressure. That's a pretty serious long range load right there.

36gr 8208 130 Berger=2788fps Holy Flippin Moley! -Primers show light cratering here. I had 1 shot at 2855.
Either load is 260 Remington with a 24" barrel territory!
130gr G1 BC bullet of.496---run that through a ballistics program- http://buybergerbullets.3dcartstores.com/270-Cal-130-Grain-Classic-Hunter_p_175.html

Just a swag here, the 110s should hit 3000 or close, 120s as shown 2850 more or less and the 130s 2700-2750.
85gr TSX 3300???

38gr CFE223, 130gr Berger=2692fps-no signs of pressure. That's a pretty serious long range load right there.

36gr 8208 130 Berger=2788fps Holy Flippin Moley! -Primers show light cratering here. I had 1 shot at 2855.
Either load is 260 Remington with a 24" barrel territory!

H335 turned out to be a little slow with the 85gr TSX 40gr =3139 with no signs of pressure-max case fill.
RE7 on the other hand worked out great-36gr RE7=3291 with no signs of pressure, could probably go to 37gr which is pretty close to max case fill.
RE7 For the light ones, 8208 and N530 for the 130s. 10x, H335 and x-term may work for the 100s.
While all powders may not produce the most velocity, everything from RE7 on the fast end to Varget and RE15 could be used with some bullets.

For those that asked about Varget. 35gr +2560fps. It wasn't near max pressure so it maybe possible to get 36gr in the case bumping the vel another 50-60ps. 2600 max IMO.
RE15 will likely be the same.
N530-35gr=2801fps max pressure not max fill.

This is the best car going, it can drive itself, and gets 250 miles per gallon of gasoline. Beats any car by 100 years, should be out @2050.

Looks like he is using the flattened or cratered primers to test for max pressure? You gotta be joking me.

Yeah, I have no problem grasping the theory of extra yardage and more energy at closer range. My point, again, is that IMO it isn't necessary.

The 6.8 has no issues with deer past 300. In my AO, I very rarely see shots like those. If I do, I can spin the extra with no worries. I'm certainly not letting Connor, my son, take those shots at this point so it's irrelevant there.

So, again, what does it offer me besides more recoil/noise for my boy to contend with?

Oh stop. George. There arent any deer in NH