Many thanks for all the advice and encouragement on here.
So I gave my 202 in .243 a good clean, checked it out with the borescope then gave it a really good clean. Thinking of a possible trade-in I took it over to Jamie at Garlands, who has loads of 202s. He persuaded me that I should keep the rifle, and just try it out with different makes of 100gr ammunition.
So I bought some ammunition, a BSA bag rest set , a large bag of rice to fill the rest, and printed off some targets 1cm square grid and 3cm diameter circle (see attached). And gave the rifle another really really good clean.
At a somewhat makeshift, but measured, 100m range, I was shooting prone off the bag rests. After about 50 rounds of 6 different types(Sako, Fiocchi, Geco, RWS, PPU, remington) I had:
- 2 rounds my really bad shooting
- 3 rounds obvious flyers (PPU twice and 1 Fiocchi)
- best MOA: 0.4 (RWS) - see attached pics - 3 shot group, though it does look like 2,
- worst MOA: 1.2 (Remington)
- av MOA off bag: 0.6
MOAs are all 3 shot groups measured with a digital caliper to nearest 0.5mm and converted by exact Excel formula.
I tried generally to give the barrel time to cool, (not least by trudging up and down the range to change targets) and I pulled-through with a boresnake every 12 rounds.
Most of the ammunition worked well from the outset, but the Geco and PPU shot much better once the barrel was fouled a bit.
I did have a couple of RWS groups where the grouping was OK but the POI went 4cm high. This was due to the barrel getting a bit hot, and settled back down once it was cool again. There is a possibility the moderator loosened a bit here too.
I was also interested in how things changed if I shot off a spartan bipod, as I suspected a problem with POI changing. Unfortunately, I had little chance to really check due to weather, however over 9 rounds, the average MOA increased just to 0.9, and interestingly POI remained the same, which was encouraging.
By the time I got to shoot off sticks, I was tired, it had started to drizzle, and the less said about that the better; other than all 6 rounds hit a roe sized kill zone. Just.
So overall my faith in this rifle is completely restored, I just need to clean it better and practice shooting it more off sticks.
Many thanks again to all.
Richard