109 hybrid seating depths

[ksnyder]

I don’t have time to do a seating depth test for the 109 hybrids and was wondering if anyone had a recommendation on where to load them for the somewhat best results. I know that there is no magic seating depth for not testing but sometimes you just got to shoot.

 

[lawebb21]

I don’t have time to do a seating depth test for the 109 hybrids and was wondering if anyone had a recommendation on where to load them for the somewhat best results. I know that there is no magic seating depth for not testing but sometimes you just got to shoot.

I by no means did an exaustive test for this but i did test a few spots. I Tried a few around 10 to 15 thou jump, 8 though jam and finally landed on 60 thou jump being the best in my gun. To know exactly i should defanitly test more but probably wont becuase i wont continue with this bullet. 108 BT Bergers shot better so i gave up on 109 bergers. hope this helps at least some. Hopefully someone else has some better answers on this than I.

 

[swd]

I’ve shot a lot of 109’s. It’s very competitive in the Dasher and BRX for F Class. I usually start at .020” off and generally end up somewhere in the .018”- 030” range. I’ve had barrels that shot so well at the .020” starting point I never bothered to do any seating work on.

 

[Bill W]

I found .024 off lands worked for both 105 and 109 bergers for me. Then again in the .060's liked es at .024 better so where I shoot

 

[Willow]

I shoot the 109's exclusively in a 6GT in an F-Open setup. Originally tried them at a 60 thou jump based on advice and they shot poorly. This was with ADI2209 powder (H4350). Moved them into 30thou off the lands and the rifle just shot dots after that. Just had the barrel (Bartlein 8 twist) set back from 32 inches to 31 (throat erosion was very low after 1000 rounds) and backed the powder charge off 0.4gr. Ran a seating depth test from 15 thou off to 30 thou and there was no noticeable difference on target, so I'm now running them about 15 thou off the lands. This bullet has been very easy to tune from my experience. S&B small rifle primer in case anyone was wondering and RWS small primers are pretty much interchangeable.

 

[Cfshooter]

My load in 6BR was .003 off.

 

[FeMan]

I am shooting them in two rifles. Both Dashers preferred jam over jump. I am jamming 0.008" in one and 0.012" in another. The best I could get jumping was 0.25 moa with them. I'm using H4895 in one rifle and RL15.5 in another.

 

[barefooter56]

I don’t have time to do a seating depth test for the 109 hybrids and was wondering if anyone had a recommendation on where to load them for the somewhat best results. I know that there is no magic seating depth for not testing but sometimes you just got to shoot.

A general rule of thumb with the Berger Elite Hunter and Hybrid Target bullets is to start your bullet seating depth testing at .015" off the lands. Then you work back into the cartridge case in .015" increments (.015",.030", .045", .060"). When you find a bullet seating depth that shows promise, you can test .005" to either side of that CBTO if you wish to see if accuracy can be improved. All bullet seating depth testing is done using the starting powder charge!

 

[Straightshooter1]

Hmmm??? I guess everyone has the same size chamber that shoots 109 Hybrids since since how far one is off the lands is stated as a seating depth???

 

[barefooter56]

Hmmm??? I guess everyone has the same size chamber that shoots 109 Hybrids since since how far one is off the lands is stated as a seating depth???

No, These are the distances off the lands per using CBTO to plot the change of bullet seating depth that we found in testing that showed the most frequency in regard to accuracy.

 

[Straightshooter1]

No, These are the distances off the lands per using CBTO to plot the change of bullet seating depth that we found in testing that showed the most frequency in regard to accuracy.

I do like your suggested in your post here, using a starting point at .015 off the lands is (IMHO) a good suggestion and then increasing the seating depth until promising results are seen. This is different than what the others were suggesting, like . . . mine works best at .060 off, or mine at .015 off, or whatever jump or jam.

Using someone else's CBTO at a guild for "seating depth" could result easily result in a cartridge configuration that might not even fit into one's chamber, just because different comparator inserts can produce significant different measurements. Then you have chambers that are cut to different lengths along with any throat erosion adding to the disfunction of trying to load a cartridge to someone else's distance off the lands.

That's not what you were doing in your post, I know. But other's were responding to OP's request for a seating depth "recommendation" by stating a distance off the lands.

This is just kind of a pet peeve of mine as this issue was very confusing to me when I first started precision reloading, where I was having a really hard time trying to duplicate someone's cartridge configuration when they were telling me to measure .XXX off the lands. Even trying to use someone else's CBTO didn't work for me since my comparator insert produced very different results.

 

[barefooter56]

I do like your suggested in your post here, using a starting point at .015 off the lands is (IMHO) a good suggestion and then increasing the seating depth until promising results are seen. This is different than what the others were suggesting, like . . . mine works best at .060 off, or mine at .015 off, or whatever jump or jam.

Using someone else's CBTO at a guild for "seating depth" could result easily result in a cartridge configuration that might not even fit into one's chamber, just because different comparator inserts can produce significant different measurements. Then you have chambers that are cut to different lengths along with any throat erosion adding to the disfunction of trying to load a cartridge to someone else's distance off the lands.

That's not what you were doing in your post, I know. But other's were responding to OP's request for a seating depth "recommendation" by stating a distance off the lands.

This is just kind of a pet peeve of mine as this issue was very confusing to me when I first started precision reloading, where I was having a really hard time trying to duplicate someone's cartridge configuration when they were telling me to measure .XXX off the lands. Even trying to use someone else's CBTO didn't work for me since my comparator insert produced very different results.

I understand. What most new reloaders do not realize is that the person posting a load or seating depth accuracy node is talking about HIS RIFLE. No two rifles are alike so you have to do your own load development with YOUR RIFLE. As FRED SINCLAIR and WALT BERGER said.. You have to feed the critter what IT LIKES.
Posting your loads ETC can get someone hurt. So please add that this data is based on MY RIFLE not YOURS. Please do your own load development. There are no short cuts here.