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No, not at all. Those are some great insights. I agree, it would be very interesting to find old load data on what people used before plastic sabots.

One thing I'd really like to figure out is...

I agree and thanks for the stern warning it is well taken. I've learned my lesson. The trouble with the cheap bird shot is the propellant is quite clearly very fast burning (there's only about 17.9...

I tested out the Svarog slugs again using two nitro cards on a FS12 gas seal. I saw pressure signs again. These weren't as bad as last time where I got torn shells but I could still see primer...

That's an interesting idea. It should theoretically work. The center of mass will be up towards the nose. I'd just have to design a tail to move the center of pressure to the back. Wasp-waisted...

Interesting. It makes sense it would have to be considerably over SAAMI spec pressure. Like you said, it's definitely a good thing that modern shotguns are overbuilt. Otherwise I'm pretty sure I'd at...

Thanks for sharing. Glad you were okay. It is funny that sometimes the very measures we take to prevent something from happening actually cause that thing to happen/make it worse.

Yes, it would be very interesting to see how wad cushioning affects pressure. Based on my qualitative examination of Nylon vs the materials that factory wads are made of I would say Nylon is much...

I agree. Better the err on the side of caution. Check out the below photos of one of the recovered slugs. All the ridges are completely flattened all the way around the slug (probably from obturating...

FYI,

I double checked my bore and I have lead deposits in my bore leading up to the forcing cone. See below photo (the white circle). It seems the slug almost certainly obturated. Yikes!

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Very interesting stuff. Thanks for sharing. I will definitely be very careful about crimp length, payload weight, and hollow base fillers (and component substitution in general) from now on.

I...

No, I hadn't heard about this incident. Thanks so much for sharing. I'm glad you were okay. It definitely sounds like your slug may have obturated. I think from now on I may just fill the hollow base...

I'm pretty surprised that an 8% increase in weight could increase the pressure so drastically. I never had any pressure signs like this before and they appear to be pretty extreme based on the shells...

Update:

I had considered not posting this because quite frankly I am embarrassed and upset with myself but I thought I would anyway so hopefully others can learn from my mistake.

Well that...

Same here. I'll be interested to see your results. I should be going out shooting mine tomorrow.

I'm really enjoying the range these days. There are far fewer people due to the ammo shortage and...

Interesting. My shotgun also has a 0.733” bore diameter. Hopefully my rifled choke will help a bit. If not I guess I can try powder coating them.

I got a new slug mould from Russia (the Svarog "Paradox" slug). It seems the wads are unobtainium so I have designed my own tail wad which repurposes the gas check from the Federal Two Part wad that...

I gave that idea a try, using only nitro cards instead of repurposing the original wad. Keyhole City today. To add insult to injury I found that my scope slid back in the rings...So there's nothing...

Update:

I went shooting today using shells with the Winchester AA12 wads as a base. The results were pretty decent I think (considering that I'm working with modified bird shot).

All groups...

Thanks for the info. The fact it will pick up larger projectiles higher above the chrony makes sense. I will definitely shoot further above it next time I use it.

I had one additional question I wanted to pose to anyone reading this thread with experience.

The last time I went out shooting I brought my chronograph. I only got about 10 shots off before an...

If anything is wrong, it's probably my shooting. I've only been shooting since 2018. Yesterday there was a bit of a right to left crosswind too. Excuses aside, I'm happy with how things are starting...

Some better groups this last time out. I added a nitro card in between the slug and the bottom part of the 2-part wad and bumped up the sabot diameter by 0.008".

I recovered a couple of the...

I had another thought. Maybe some of the slugs are tumbling because of their velocity. The theoretical muzzle velocity is about 1160 fps. According to information I found on the BC of this slug, at...

Thanks for sharing. Thinking about the wads, I suspect I may know the reason for the poor release. The bottom part of the two part wad has a lip that sticks out at the bottom (see below). It may...

Thanks for your advice. It is much appreciated.