25 wssm CoyoteWith a proper barrel cleaning, trigger tuning and good shooting technique box stock (kinda) rifles can produce very good accuracy. Now we will go after some really fast velocity along with good accuracy for the varmint loads, these will be handloads directed at squeezing out the best performance using a 75grain Hornady A-max bullet that will be focused at reaching 3600fps.
Stay tuned in for range results on the 75 grain varmint loads…I was surprised at the powder of choice I ended up with.
Testing 75 grain varmint loads, a surprising powder came out the winner
Varmint loads…velocity with a good bit of accuracy to boot! The target fps I wanted to have was 3600 along with tight accurate grouping. I had some varieties of powder on hand however I will admit while sitting on 8+ pounds of IMR4064 I was driven to make that powder work! Funny how things work out and I did learn some unique traits of this short fat powerhouse of a .257 caliber.
*ALL LOADS REPRESENTED IN THIS ARTICLE ARE SAFE IN THIS RIFLE. DO NOT DUPLICATE ANY LOAD INFORMATION LISTED UNLESS YOU REDUCE THE CHARGE AND WORK UP SLOWLY. SOME OF THESE LOADS ARE NEAR MAXIMUM ACCORDING TO PRINTED RELOADING MANUALS*
I start by prepping my fired cases with a shoulder bump die three thousands less than fire formed length, I used a Sinclair shoulder bump gauge and a caliper. CCI BR2 primers are used thru out all the load development (I have found them to be good performers in past cartridge/load work and they are my go to primers ). These wssm cases have the thickest necks you will find (.022”) on the average, I turned the necks to .014” thick and will talk more about that later……ughh. Hornady V-max was the bullet of choice at 75 grains and IMR4064, Varget and IMR4320 were the powders.
Starting loads with what I thought was a great powder (since I had so much of it). A quick run thru Quick Load gave me starting charges along with safe estimated chamber pressures. A shoulder bump length of 1.218 measured with gauge and cartridge overall length (C.O.L.) ranging from 2.340” – 2.380”, 45.5 up to 46.3 grains of IMR4064 was sitting under a 75 grain v-max, ignited by a CCI BR2 primer.