270 win velocity question?

[Philward]

I needed to load some rounds for my 270 Rem 700 mountain rifle, 22" barrel. Been shooting 130g Speer lately but have some 130g Barnes tsx and ttsx as well as some Nosler 130g BT. In the past I have used the Hornady 140g BT and have a box of those on the shelf. I already had an established load for the Hornady bullets so I loaded up some of those to see if they still shoot. The load: 59g of RL22, cci200, seated .030 off lands with a length of 2.795 using the Hornady comparator. Velocity on my chrono was 3150-does that seem true? That's my question, could that be the actual velocity? Other loads I shot at same time and with same chrono setup were same 140g bullet with IMR 7828 at 58 2885-2900fps 3 shots and 58.5 grains with vel of 2950-2990 130g Barnes TSX using IMR 4831@56grains for velocity of 2995-3010 4 shots, and [email protected] grains with velocity 2950-3000 5 shots(but only 2 registered on the chrono).

The 3150 velocity repeated at the end of the session-I shot 3 rounds first and at end shot 3 more with same velocity so it's consistant.

 

[jjmp]

Yes

 

[bob4]

It's possible. Have another load that you have chronographed before to check your chronograph? When I question my magnetospeed in goes a new battery.

 

[zr600]

What kind of chronograph?

 

[Philward]

Chrono is a shooting chrony beta f1. Yes to previous load, from a couple years ago, 7rm in rem 700 lr, 162 eldx 66g rl22, 3k fps. Shot at same time, yesterday, same velocity from 2 years ago.

 

[venatic]

I wouldn't trust beta 1 too much.... I have had variations of 100 fps from one day to next I guess due to lighting conditions.

 

[squeezenhope]

Only way to be sure is with a reliable chrono. I will say R22 is a game changer in most .270's. It's possible.

 

[Orange Dust]

Only way to be sure is with a reliable chrono. I will say R22 is a game changer in most .270's. It's possible.

Yes it is entirely possible. Especially in the summer. I've seen RE22 post some incredible velocities in the summer.

 

[MagnumManiac]

That is exactly same load my Dad uses, except different bullet.
In his 22" barrel, best we could get was 2895fps with 140gr Accubonds.
Awesome results on deer with those, but for our large Sambar deer here, we prefer the 150gr Partition @ 2850fps.

RE22 is very good in the 270, faster bullet speed than most other powder, but is quite temp sensitive, as I found in my 25-06. Winter loads were fine, but in summer those same loads blew primers.

Cheers.

 

[zr600]

Has anyone tried rl23 supposed to be temp stable and close to rl22.

 

[jjmp]

MM, those must have been some hot loads in your 25/06, mine sports a 26 cm/1/10 tw Shilen cut dwn from a full hwy blank , I've used RL/22 to push 100 GN/NBT's to 3499 in 70 degree weather / test & sited in same load for deer hunting temp 24 degrees , lost like 74 fps , never blew any primers ever . Used many Imr powders they lost on average 100 plus fps . Funny no one talks about that but they put dwn RL/ 22 almost always I'm not buying that it's great powder !.

 

[feelinducky]

Try h4350 or imr 4350 with the barnes. Use the barnes book for their charge loads. I used rl22 but one day it was great then the next day it was funky.

 

[Philward]

I wouldn't trust beta 1 too much.... I have had variations of 100 fps from one day to next I guess due to lighting conditions.

I believe them to be as accurate as any other chronograph, as long as the same one is used to compare different loads. Using 3 different make or model chrono will probably give 3 different velocities. I will say that it was a sunny day, late afternoon, had the diffusers mounted for most of the shooting except on the last 3 shots, after the first shot the nearside diffuser flew off with Vel of 2995. The next two shots were 3550 & 3545. So yes light can play havoc with the readings

 

[Philward]

Yes it is entirely possible. Especially in the summer. I've seen RE22 post some incredible velocities in the summer.

I've not heard this...