284 win vs 7 shehane

[carlsbad]

I'm getting a lot of heat from my 284 shehane. Yesterday the strings were only 15 rounds plus 2 sighters and the barrel was mighty hot.

I haven't fireformed my new lapua 6.5x284 brass to shehane yet. I'm thinking of switching to straight 284 win.

My shehane load is mild. 56.0 grains of 4831SC behind a 184 berger. 2830 fps.

Will I get much less heat out of a 284win? Basicly I'm firing the shehane so mild that it isn't much different. But I guess at last I wouldn't need to fireform brass.

Any thoughts would be appreciated.

--Jerry

 

[MattPeetz]

No. It will heat up the same. Get some type of chamber cooler to cool it

 

[Keith Glasscock]

It's going to get hot either way. I wouldn't expend any additional effort/resources switching.

 

[Pappy42]

It might even get hotter. You will have to run higher pressures in the .284 case to get the same velocity as the Shehane. The other downside is shorter case life.

 

[284winner]

I've never seen much change in case life as the shoulder change isn't much different. As far as heat difference, you won't see less heat with the .284 win.

 

[carlsbad]

Thanks guys. Sounds like flip a coin. I've got new barrel blanks, reamers for both, and new lapua brass. I have to do load development for either. The deciding factor may be avoiding 500 rounds of fireforming is in favor of 284.

 

[Steve Blair]

I'm getting a lot of heat from my 284 shehane. Yesterday the strings were only 15 rounds plus 2 sighters and the barrel was mighty hot.

I haven't fireformed my new lapua 6.5x284 brass to shehane yet. I'm thinking of switching to straight 284 win.

My shehane load is mild. 56.0 grains of 4831SC behind a 184 berger. 2830 fps.

Will I get much less heat out of a 284win? Basicly I'm firing the shehane so mild that it isn't much different. But I guess at last I wouldn't need to fireform brass.

Any thoughts would be appreciated.

--Jerry

My 6BR gets hot, as does my .284 Shehane and .300 WSM. It's the firing cadence that's the problem. I believe you took thermodynamics. When thermal input exceeds outflow in a given mass, temperature rises. That said, my Shehane barrels last ~1700 rounds, 6BR ~2000 rounds and .300 WSM ~1500 rounds. Cost of doing business.

 

[carlsbad]

So you're saying I need to use the entire time I'm allotted? I have to admit, I tend to be fast once I start hitting the x. I do have that on my list to work on.

I have a stiff neck from high school football and the prone position gets old quick so I tend to rush.

OK. I'll look for a yoga class.

--Jerry

 

[Steve Blair]

That's a viable approach but would require an absolute wind call on every shot. That's not a bad thing, I strive for it. Most strings encompass both relative and absolute calls. We like to minimize risk, so that means shooting fast when you can and pausing when you must.

 

[ShootDots]

I'm getting a lot of heat from my 284 shehane. Yesterday the strings were only 15 rounds plus 2 sighters and the barrel was mighty hot.

I haven't fireformed my new lapua 6.5x284 brass to shehane yet. I'm thinking of switching to straight 284 win.

My shehane load is mild. 56.0 grains of 4831SC behind a 184 berger. 2830 fps.

Will I get much less heat out of a 284win? Basicly I'm firing the shehane so mild that it isn't much different. But I guess at last I wouldn't need to fireform brass.

Any thoughts would be appreciated.

--Jerry

56.0grs of H4831sc is NOT NECESSARILY a "mild" load. I had 2 Shehanes and one of my Shehanes shot (I believe, I can't remember exactly) 55.4grs which ran right at 2915f.p.s. with a 180 Hybrid. The 184 was not even thought of yet at that time. The Lot-to-Lot consistency of H4831sc is notorious for large swings in burn rate. I have myself seen 3/4 grain and my old 'smith had nearly 2.0gr difference to reach the same velocity. You may have to INCREASE or DECREASE the amount of powder back to your velocity if you change powder lots. I have heard from knowledgeable people that the water capacity of a Shehane is right at 3.3grs. more than a straight .284.. I can tell you from experience that depending on the "burn rate" of the individual lots of H4831sc, the REAL powder capacity difference is only about 1.1- 1.3grs. So in my opinion, switching to a straight 284 would be an expensive exercise in futility to try and keep a "cooler" barrel..

 

[boiler_house7]

I feel your pain. Shot a match yesterday and temp was at 92 deg start of relay 3. Didn't have a big break from 2. Had the barrel cool spinning between each relay. Finished up relay 3 and pulled the mirage shield off the barrel and Velcro dots came off with it, No Velcro dot on the barrel other than the one at muzzle just glue. Ouch, it was hot. 7 rsaum playing with RL-16. Don't think it woulda mattered much if I woulda fed N-165 in the saum or ran wunna my .284's on 4350 given the ambient temp. Cost me .004 throat erosion and a little wrinklen in the chamber like a wild child. I'm like you, I'm looking at the Heat of explosion on powders. Man we gotta shoot what works, But maybe a dab cooler powder might help a tad on these killer hot days. Just dunno. I will say this that 16 is dirty and I figured that barrel woulda been coppered up fairly bad with the high heat, but it was actually fairly mild. Most that have ran it a bit have seen the same on coppering.

 

[carlsbad]

OK. I've decided to go straight 284 for 2 reasons:

1. avoid fireforming.
2. Not pushing the shehane hard enough to justify it.

Thanks for all your help. I'll probably end up at the same velocity with the 284.

--Jerry

 

[creedfan]

OK. I've decided to go straight 284 for 2 reasons:

1. avoid fireforming.
2. Not pushing the shehane hard enough to justify it.

Thanks for all your help. I'll probably end up at the same velocity with the 284.

--Jerry

what load will you be going with on the 284? i am asking because i will soon start load work for my 284.

 

[DJSBRS]

Thanks guys. Sounds like flip a coin. I've got new barrel blanks, reamers for both, and new lapua brass. I have to do load development for either. The deciding factor may be avoiding 500 rounds of fireforming is in favor of 284.

I can hydro form you the 284 Shehane that are ready for your full Shehane load and save the wear and component expense..

DJ
DJ's Brass Service
205-461-4680

 

[carlsbad]

DJ,
Thanks. I don't know why I didn't think of that. I would go that route if I were to go shehane. What is the cost per 100? thanks.

--Jerry

 

[DJSBRS]

DJ,
Thanks. I don't know why I didn't think of that. I would go that route if I were to go shehane. What is the cost per 100? thanks.

--Jerry

To hydro form Norma 284 to Shehane is .60¢ each. To hydro form 6.5 x 284 Lapua is .80¢ each. Neck turning is .60¢ each.

Thanks for your inquiry.

DJ

 

[carlsbad]

DJ,
Definitely less expensive than fireforming.

thanks,
Jerry

 

[ShootDots]

DJ,
Thanks. I don't know why I didn't think of that. I would go that route if I were to go shehane. What is the cost per 100? thanks.

--Jerry

I can tell you from experience that DJs Brass Service does VERY excellent work and in an incredibly short time frame!

 

[ihmsakiwi]

what load will you be going with on the 284? i am asking because i will soon start load work for my 284.

I'm watching this also. About to start 284 Win testing also. Haven't decided on 7mm projectile yet as the previous owner of my rifle was a A-Max fan but they are no more.
Peter

 

[1shot]

FF your brass at a club match and all is good. You get quality trigger time and I have found that during fire forming the loads shoot well enough to clean a LR-1 target.

Lloyd