6.5 WSM- 147eldm or 156 eol?

[jjohnsonElknewbie]

Im looking in to this. Does anyone make dies for it? I have a 25-270 wsm

Lee and Redding make 6.5WSM dies.

 

[wind gypsy]

Thanks for the reply, you are correct in that my 300 barrel is 24". So that does account for a little over 100fps.
So wind drift is the key factor we are looking for? Id like to know what the actual difference would be, I don't have the software to run that.
I've got 3 rifles in pieces on my bench and I'm just trying to find an idea of what to do with them. I've been thinking one 7wsm with the 180eldm. One in either 6 or 25x284 and the last is either going to become a 25wsm with 145's, a 25 western with 134's, or a 6um with 108's

As far as restricting bore size, you are aware of "barrel burners". The concept of restricting bore size increases pressure, and pressure=force. When you are dropping grain weights you are reducing felt recoil. However when you keep the same grain weight you are actually increasing force. For example a 25-08 with a 125 grain bullet would recoil more than a 308 with a 125 grain bullet loaded to match muzzle velocity. If you load to match powder the recoil will be similar but the 308 will be a good bit faster.

There are recoil calculators to compare such things.

ShootersCalculator.com | Recoil Calculator

An online calculator that calculates the recoil energy, impulse, and velocity of a firearm according to the firearm's weight, powder charge, bullet weight, and bullet muzzle velocity.

shooterscalculator.com

And free ballistic calculators

JBM - Calculations

www.jbmballistics.com

 

[wildwilderness]

I did get unpublished reloading data from Berger for the 6.5 wsm and the 156 eol . You can always email them for info

 

[jjohnsonElknewbie]

Getting just shy of 3100 MV with 23” barrel.
66 grains n565
Factory primed Hornady 270 WSM brass
147 ELDM

 

[jk_minn]

Getting just shy of 3100 MV with 23” barrel.
66 grains n565
Factory primed Hornady 270 WSM brass
147 ELDM

Did you do a ladder test with the N565 and that combo? Curious roughly at what gr powder you found pressure?

 

[jjohnsonElknewbie]

Did you do a ladder test with the N565 and that combo? Curious roughly at what gr powder you found pressure?

I should've written this down, but IIRC, I started a pressure ladder at 63 gr and increased by .5 grain, and I hit bolt lift at 66.5. I have some Norma brass with Rem magnum primers prepped, and I'm going to see if I get the same results.

I meant to add that half of my Hornady brass (primed factory seconds) needs neck turned because the necks are too thick for my chamber. I see ADG has 270 WSM back in stock and I may pick some of these up based on their good reputation.

 

[jk_minn]

I should've written this down, but IIRC, I started a pressure ladder at 63 gr and increased by .5 grain, and I hit bolt lift at 66.5. I have some Norma brass with Rem magnum primers prepped, and I'm going to see if I get the same results.

I meant to add that half of my Hornady brass (primed factory seconds) needs neck turned because the necks are too thick for my chamber. I see ADG has 270 WSM back in stock and I may pick some of these up based on their good reputation.

I’ve got ADG 270 WSM brass prepped to do a pressure ladder - this info helps!

 

[jjohnsonElknewbie]

I’ve got ADG 270 WSM brass prepped to do a pressure ladder - this info helps!

Awesome man, and lmk how it turns out for you. Here is my load card and first group shots FWIW.

 

[NWBLKTAIL]

I should've written this down, but IIRC, I started a pressure ladder at 63 gr and increased by .5 grain, and I hit bolt lift at 66.5. I have some Norma brass with Rem magnum primers prepped, and I'm going to see if I get the same results.

I meant to add that half of my Hornady brass (primed factory seconds) needs neck turned because the necks are too thick for my chamber. I see ADG has 270 WSM back in stock and I may pick some of these up based on their good reputation.

Before you pick some up, I have two unopened boxes I was getting ready to list. I’ll give you deal on them.

Shoot me a PM if interested

 

[wildwilderness]

Getting just shy of 3100 MV with 23” barrel.
66 grains n565
Factory primed Hornady 270 WSM brass
147 ELDM

That seems like some fast powder, maybe I should give it a try

 

[jjohnsonElknewbie]

That seems like some fast powder, maybe I should give it a try

That MV was measured with a magneto sport. I have a brand new Athlon Rangecraft and intend to validate once it warms/dries up a little.

 

[jjohnsonElknewbie]

Hey guys, I got out to the backyard range and validated 2 loads from my 25-284 and the 147 load from my 6.5 WSM on the new Athlon. The range card is in post #28. Having only used a Magneto bayonet in the past, the Athlon was a breath of fresh air, and connecting it to my phone to the app was super cool.

My HCA mag holds 3 rounds, and I fired 3 groups on the same target. The barrel is OEM fluted Tikka 6.5 PRC re-chambered to 6.5 WSM. The temp was around 30 degrees, and cool down time between shots was my walking 100 yards down to the target, snapping pics, and walking back.

I used the same KGM R30T (titanium) can for all 3 load tests with a LS Wild Ultralight cover. I am super impressed with this cover as after 27 high velocity rounds in fairly rapid succession, I had zero mirage.

I shot these from prone with an old Harris bipod in front and a stuffed backpack for a rear bag. Stock is OEM Tikka with vertical grip and Limbsaver.

Please see the attached progression pics and Athlon data for more information. 7/9 are right at .5", and the entire group is around .75". I'm pretty tickled with these results, although the ES and SD aren't the greatest.

EDIT: I had the wrong Athlon data listed. I replaced with correct session.