Fire forming 260AI

[VaRandy]

Suggest you fire the formed cases next and try a stiffer load of 4361 (try to find someone else with barrel your length in an Ackley) an also change to the Bergers at same jump. Note the result, then go back and redo the test on Jump for the Bergers (very likely much higher jump). Keep good record on the target paper.

If you want for grins, repeat the forming load and change out only the bullet, leave the jump the same, and carefully fire 3. I will help you find the amt of powder for the first test if you wish.

 

[Fast14riot]

This thread popped up today as someone liked a picture in it, and made me think how this gun has evolved.

Here is how that action is sitting now. New 1.25" 1:8 Kreiger 29" barrel, Revolution stock. Had the action durakoted, too.



This was a seating depth test from this past weekend with RL23 and 153.5 Berger.



Funny thing is, I still have the 40xb stock and another action that will be getting another 260AI barrel and essentially recreating the same gun as before!

 

[Bill Norris]

WOW hard to beat that 260AI for accuracy and ease of load development. Love both my 700 and 40X in 260AI. WOW WOW That is a long CBTO for sure.

2022-07-28_13-41-00

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[Fast14riot]

WOW hard to beat that 260AI for accuracy and ease of load development. Love both my 700 and 40X in 260AI. WOW WOW That is a long CBTO for sure.

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Yeah, I can't eject a live round, lol! I have to pull the bolt. COAL is around 3.109" at my starting length. Those 153.5 are just over 1.5" long alone!

 

[Bill Norris]

Yeah, I can't eject a live round, lol! I have to pull the bolt. COAL is around 3.109" at my starting length. Those 153.5 are just over 1.5" long alone!

Yes Sir, that is a long bullet. I looked at the 147 gr. and decided against it because it was simply longer than I wanted to deal with. The pressure ring was going down past the neck/shoulder junction which I try to stay away from. The Berger 144 gr. is the longest I have loaded for either of my rifles so far with great results I might add.

 

[Fast14riot]

Yes Sir, that is a long bullet. I looked at the 147 gr. and decided against it because it was simply longer than I wanted to deal with. The pressure ring was going down past the neck/shoulder junction which I try to stay away from. The Berger 144 gr. is the longest I have loaded for either of my rifles so far with great results I might add.

When I rebuild the original version of this gun, its going to get 140s, I still have some 140VLDT left. Keeps the recoil manageable with the light weight and hard rubber butt plate.

 

[Bill Norris]

When I rebuild the original version of this gun, its going to get 140s, I still have some 140VLDT left. Keeps the recoil manageable with the light weight and hard rubber butt plate.

Yea, that 140 gr. VLD Long Range Target is hard to beat in both my rifles.

 

[Fast14riot]

Something else of note, if you look at my recent seating depth test, the two groups on the bottom are both 5 round groups fire forming (foulers for this session). This time I used pulled 130smk but the same exact load. I don't even change my seating die for these. I have never once done any kind of load development for fire forming. I have done well in 600y matches with this load, too. It has shot well with any bullet from 130-144gr for fire forming, as well as in standard 260rem.

I never fiddle with it, I just dump 44gr H4831 under a bullet, seat and shoot.

For formed cases, 140 class bullets start at 47gr and go up to just over 48gr of either H4831 or RL23. 150 class bullets start at 45gr and go up to just over 46.5gr of either powder. Makes load development short and sweet. Will always find a good load somewhere in there.

140VLDT I shot 47.3 RL23. 140rdf 47.9 H4831. 150smk 45.3 rl23. 153.5 LRHT 45.5 rl 23.