Temperature vs Velocity

270elk

Beginner
Aug 14, 2017
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The attached data was shot over the past year at various temperature. The 270 was shot out of a Forbes with a 24 inch barrel. The 30-06 is a SAKO 85 with a 22.4 inch barrel. The velocity are a 3 shot averages.
Temperture/Velocity
Loads Temp/Velocity fps Temp/Velociy fps Temp/Velocity fps
270 Win; 130 gr, 57.5 RL 22 90/3184 45/3145 29/3086
270 Win; 140 gr, 56.0 RL 22 90/3021 45/2943 29/2995
270 Win; 150 gr, 54.0 RL 22 90/2905 45/2880 29/2870

30-06; 165 gr, 56.5 RL 17 90/2923 45/2857 29/2858
30-06; 180gr, 57.0 H4350 90/2782 45/2749 29/2722
Overall, the velocity variation at various temperatures is excellent for hunting.
 
Interesting data. Always finding new things out.

Interesting that the RL 22 had a 98 fps velocity swing at opposite temps with the 130 grain, but only a 35 fps swing with the 150's. Good loads though on both speeds and temp stability across the board on both cartridges with only the 130 load possibly considered marginal on temp stability. But still a real good load speed wise even at the lower end. Thanks for posting.
 
Surprised H4350 had that big a variance! Should be a full case too, with the 180s.


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Pretty interesting. Been using 22 for a long time now. Didn’t know till I’d heard on the internet about what a horrible powder it was. It never failed me, was fast and accurate. My biggest variances with it were always different lots of powder more so than the cold problems.
 
SJB358":1y1s4d5r said:
Pretty interesting. Been using 22 for a long time now. Didn’t know till I’d heard on the internet about what a horrible powder it was. It never failed me, was fast and accurate. My biggest variances with it were always different lots of powder more so than the cold problems.

Scotty, very recently I helped work with loads for elk in a Rem 700 in 7mm, actually 2 of them. A full load of RL22 with a 150 gr TSX was the first bullet/powder combo that impressed me with either of those rifles. Shot under 1/2" in the rifle that was settled on, and averaged 3085 with the chrono set up 20' from the muzzle. Struggled to get speed out of both of those rifles. Nothing else tried came close to that for speed and accuracy. Certainly at least not both at the same time.
 
ShadeTree":1e6avpaj said:
SJB358":1e6avpaj said:
Pretty interesting. Been using 22 for a long time now. Didn’t know till I’d heard on the internet about what a horrible powder it was. It never failed me, was fast and accurate. My biggest variances with it were always different lots of powder more so than the cold problems.

Scotty, very recently I helped work with loads for elk in a Rem 700 in 7mm, actually 2 of them. A full load of RL22 with a 150 gr TSX was the first bullet/powder combo that impressed me with either of those rifles. Shot under 1/2" in the rifle that was settled on, and averaged 3085 with the chrono set up 20' from the muzzle. Struggled to get speed out of both of those rifles. Nothing else tried came close to that for speed and accuracy. Certainly at least not both at the same time.

RL22 and a 7 Rem Mag were like peanut butter and jelly for me for a long time. It never failed to produce excellent groups and speed. I’m not terribly surprised it worked so well.
 
SJB358":d5byoa9p said:
ShadeTree":d5byoa9p said:
SJB358":d5byoa9p said:
Pretty interesting. Been using 22 for a long time now. Didn’t know till I’d heard on the internet about what a horrible powder it was. It never failed me, was fast and accurate. My biggest variances with it were always different lots of powder more so than the cold problems.

Scotty, very recently I helped work with loads for elk in a Rem 700 in 7mm, actually 2 of them. A full load of RL22 with a 150 gr TSX was the first bullet/powder combo that impressed me with either of those rifles. Shot under 1/2" in the rifle that was settled on, and averaged 3085 with the chrono set up 20' from the muzzle. Struggled to get speed out of both of those rifles. Nothing else tried came close to that for speed and accuracy. Certainly at least not both at the same time.

RL22 and a 7 Rem Mag were like peanut butter and jelly for me for a long time. It never failed to produce excellent groups and speed. I’m not terribly surprised it worked so well.

I'm still not sure what the big struggle was with speed on those 2 rifles. Every powder tried started out way off from what it should've been and never caught up at top loads. Started out with 160 grainer's and both rifles were pitiful on speed. I'd of blamed the chrono except two 300 win mags were also being tested and they were right where they should've been.

Switching to 150's and RL22 brought it to life big time.
 
SJB358":268c8i8t said:
Pretty interesting. Been using 22 for a long time now. Didn’t know till I’d heard on the internet about what a horrible powder it was. It never failed me, was fast and accurate. My biggest variances with it were always different lots of powder more so than the cold problems.

Same here, I use RL-22 as well and I knew it was temp sensitive but shoots excellent in my 300 Win Mag with those 180 Ballistic Tips and Accubonds. I was pushing those 180 pills at 3190 -3200 fps with no pressure signs and shoots amazing groups.

The Hodgdon powders are indeed more temp stable and I love them, but velocity is a tad slower. Except the Retumbo which pushed the 160 grain Accubonds in my 7 Magnum at 3160 fps out of the Sako M995.
 
IMG_1248.jpgA little more data: I recently purchased a Kimber 8400 in a 300 WM. After a significant break-in shooting session I started the reloading process. I started with a favorite of mine of 165 Nosler AccuBond with 77.0 gr of RL 22. This shot well (a little under an inch) and the recoil did not rearrange my glasses. The Rifle really likes the 180 gr Hornady SST or Interbonds with 74.8 gr of RL 22. I am not a big fan of 26 inch barrels and I surmise that is the reason for a 3122 fps avg with this load. The temperature was pushing 90 degrees.
 
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