I have a bergara B14 hmr in 308win, which has Ogive at 2.2815'' with sierra MK 175gn bullet. So I tried to reload my ammo with 2.2615'' ogive. It turns out the 1st round in magazine is able to be loaded, but the following rounds in the mag all stuck between breech and mag and are unable to be loaded. I've deducted the ogive to 2.2500'' but still the same. Am I doing sth wrong or shall I keep deducting until it loads properly? I have to mention the rifle and mag have no problem loading federal gold metal 168gn.
[help] Unable to load ammo with Ogive
- Thread starter xugz0212
- Start date
xugz0212, is your ogive 2.2815" measurement with Sierra 175gn a max distance to the lands? If so, what is the COAL of this round? Not very familiar with Bergara but you most likely are exceeding the max cartridge overall length (COAL) you can load in your magazine and thereby creating the jam.
Try getting the following measurements to troubleshoot your issue:
1. Measure the max length you can load into your magazine using calipers (back wall to front wall on inside of mag).
2. Measure the COAL of the 168gr Federal Gold Medal round, which feeds properly, and see if it is shorter than max length of magazine.
3. Measure the 175gr load's COAL, which is jamming, and check if it exceeds the max length of magazine.
The max magazine length round you will be able to reliably load in your rifle will likely fall between the 168gr and 175gr loads. Similarly, if you are able to get a cartridge base to ogive (CBTO) measurement with the 168gr round, compare it to the CBTO you are getting with the 175gr bullet.
You are most likely doing the right thing by shortening your rounds, but above measurements will empirically verify this for you. To reliably feed from your magazine, the rounds have to have enough clearance in overall length to not get misaligned sideways or tip up or down as they are being pushed up and out of the magazine. The max COAL of any round, to feed reliably, has to be somewhat less than the max length measurement from step 1. You may still need to be shorter to feed reliably due to the magazine design, but definitively cannot be longer.
Try getting the following measurements to troubleshoot your issue:
1. Measure the max length you can load into your magazine using calipers (back wall to front wall on inside of mag).
2. Measure the COAL of the 168gr Federal Gold Medal round, which feeds properly, and see if it is shorter than max length of magazine.
3. Measure the 175gr load's COAL, which is jamming, and check if it exceeds the max length of magazine.
The max magazine length round you will be able to reliably load in your rifle will likely fall between the 168gr and 175gr loads. Similarly, if you are able to get a cartridge base to ogive (CBTO) measurement with the 168gr round, compare it to the CBTO you are getting with the 175gr bullet.
You are most likely doing the right thing by shortening your rounds, but above measurements will empirically verify this for you. To reliably feed from your magazine, the rounds have to have enough clearance in overall length to not get misaligned sideways or tip up or down as they are being pushed up and out of the magazine. The max COAL of any round, to feed reliably, has to be somewhat less than the max length measurement from step 1. You may still need to be shorter to feed reliably due to the magazine design, but definitively cannot be longer.
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