Tikka Bottom Metal Bent

[FaaSamoa]

Got a 10 round group in with all of em. There’s a repeating pattern so looks like I need a lot more practice

 

[ztc92]

Got a 10 round group in with all of em. There’s a repeating pattern so looks like I need a lot more practice View attachment 941650View attachment 941651View attachment 941652View attachment 941653View attachment 941654

More practice is never the wrong answer, but that said, what is the pattern you are seeing? About 7-8 shots in a good group and 2-4 shots that fall outside of the smaller “group”?

If so, there is a chance that pattern is due to you, the shooter, but it also could be within the guns cone of fire. There’s a great thread on here that goes through it based on hornadys podcasts that ruffled a lot of feathers.

The short version is that the bullet impacts follow a gaussian distribution, AKA a bell curve. 68% will be within 1 SD of the mean, 95% will be within 2 SD and 99.7% will be within 3 SD.

So all that to say, it could be you need more practice, but it also could be that the smaller “group” you see as a pattern is from the 62% and the shots that are farther away are coming from the remaining 38% that are 2+ SD from the mean.

 

[FaaSamoa]

More practice is never the wrong answer, but that said, what is the pattern you are seeing? About 7-8 shots in a good group and 2-4 shots that fall outside of the smaller “group”?

If so, there is a chance that pattern is due to you, the shooter, but it also could be within the guns cone of fire. There’s a great thread on here that goes through it based on hornadys podcasts that ruffled a lot of feathers.

The short version is that the bullet impacts follow a gaussian distribution, AKA a bell curve. 68% will be within 1 SD of the mean, 95% will be within 2 SD and 99.7% will be within 3 SD.

So all that to say, it could be you need more practice, but it also could be that the smaller “group” you see as a pattern is from the 62% and the shots that are farther away are coming from the remaining 38% that are 2+ SD from the mean.

To me it looks as if it’s low left high right bias in three of the groups, meaning I’m possibly torquing the system a bit or not in line recoil wise/ anticipating a bit.

Definitely agree I need 20-30 round groups to get a good grip.
Since my first groups with 62g BF were so bad, wanted to ensure with different ammo there wasn’t a problem with the system.

Thank you for the input !

 

[atmat]

Don’t use 65” lbs on factory tikka bottom plastic. I doubt you read that anywhere here. 60-65” lbs values are what I use for metal replacement units only.

I’ve seen screw stripping, hairline cracking, and general deformation above 55ish” lbs on factory plastic. Not always. But does occur often.

I’ve used 65 on all of my Tikkas based on Form’s recommendations. Never had an issue with deforming/cracking/splitting/etc. I always kept an extra BM just in case, but never used it.

Yep. At 45 in-lbs the 3 or 4 we were using to check would all have zero shifts from drops. Having a zero shift from normal hunting and use didn’t happen often, but it did. This was started as an experiment because I wasn’t having any shifts ever, and a couple others I hunt/shoot with were. I had always taken Tikka’s apart and did my standard precheck- freefloated, degrease, loctite and torque tight.
The others were keeping them at factory stated torque, I think at the time was 40 or 45 in-lbs.
Long story shorter we started experimenting with it and all of them were less stable at 45 in-lbs. I was actually tightening way tighter than 65 in-lbs as I wasn’t using a torque wrench and just going by what felt right…. No issues. We went to 65 in-lbs and all the issues went away. After a bit it was discovered that some rifle- about 1-2 out of 10 could still have small shifts when dropped. Spot bedding the lug and tang solved that.

 

[LongWayAround]

I think I have my bottom plastic torqued to about 55lb.

AAC 75gr BTHP groups about 1.75" per 10.
Hornady 73 ELD-M is about 1"-1.25".

Hornady Black 75 seems to be the best for me in terms of cost vs accuracy. The last four I shot to check zero were all touching. Ten round groups about 1.25-1.5"

Hornady Frontier was bad enough that I only bought one box. Not sure exactly what the load was.

 

[FaaSamoa]

I think I have my bottom plastic torqued to about 55lb.

AAC 75gr BTHP groups about 1.75" per 10.
Hornady 73 ELD-M is about 1"-1.25".

Hornady Black 75 seems to be the best for me in terms of cost vs accuracy. The last four I shot to check zero were all touching. Ten round groups about 1.25-1.5"

Hornady Frontier was bad enough that I only bought one box. Not sure exactly what the load was.

I’ll have to try that Hornady black

 

[mxgsfmdpx]

I’ve used 65 on all of my Tikkas based on Form’s recommendations. Never had an issue with deforming/cracking/splitting/etc. I always kept an extra BM just in case, but never used it.

60-65” lbs, in some cases, not always, does in fact cause what I described. I’ve never seen that happen with 50-55” lbs.

 

[atmat]

60-65” lbs, in some cases, not always, does in fact cause what I described. I’ve never seen that happen with 50-55” lbs.

I had heard that which is why I kept extra BMs. But on my 3 tikkas it had no issues.

I think Form said he’s seen 1 where it’s had issue at 65.

So not saying you’re wrong, but I’d do it again haha

 

[FaaSamoa]

I had heard that which is why I kept extra BMs. But on my 3 tikkas it had no issues.

I think Form said he’s seen 1 where it’s had issue at 65.

So not saying you’re wrong, but I’d do it again haha

Yeah mine was definitely pretty deformed at 66 as my rear action screw had pulled into the stock a bit and middle near magazine was bowing out, backed it out to 55 and it sits a lot more flush so don’t think any permanent damage was caused. And maybe it would still be ok bent like that lol

& also sure sliding a washer in would solve that bending