Пускай меткость сегодня плохая, продолжай целиться в булл.

Here пускай does not mean let in the literal permission sense. In this sentence, it works like even if, granted that, or let it be that.

So Пускай меткость сегодня плохая... means something like Even if your accuracy is bad today...

This use is common in conversational Russian. A close alternative is пусть, which is a bit more neutral and very common: Пусть меткость сегодня плохая, продолжай целиться в булл.

Because меткость is a noun, and плохая is an adjective agreeing with it.

• меткость = accuracy, precision, marksmanship
• плохая = bad

So literally, this part is accuracy is bad today.

If Russian used плохо, that would be an adverb, and the sentence would need a different structure, for example: Сегодня ты плохо целишься = Today you aim badly

Because меткость is a feminine noun. Russian adjectives must agree with the noun in gender, number, and case.

• меткость ends in -ость, which is very often feminine
• therefore the adjective is feminine too: плохая

Compare:

• плохой результат = a bad result
• плохая меткость = bad accuracy
• плохое зрение = bad eyesight

Russian often leaves out possessives like your, my, or his when the meaning is already obvious from context.

So меткость сегодня плохая naturally means your accuracy is bad today if the speaker is clearly talking to one person.

If you want to make it explicit, you can say: Пускай твоя меткость сегодня плохая...

Adding твоя gives extra emphasis, but it is not required.

Продолжай целиться means keep aiming or continue aiming. It emphasizes that the action is already in progress and should go on.

• целься = aim
• продолжай целиться = keep aiming / continue to aim

So the sentence is not just giving a basic command; it is encouraging persistence despite poor accuracy today.

This is a very common Russian pattern:

• продолжай работать = keep working
• продолжай смотреть = keep watching
• продолжай целиться = keep aiming

It is accusative, because целиться в кого? во что? takes в + accusative.

So:

• целиться в мишень
• целиться в цель
• целиться в булл

In this specific case, булл does not visibly change form because it is a masculine inanimate noun, and for many such nouns the accusative singular looks the same as the nominative singular.

It is understandable, especially in sports, gaming, or dart/shooting contexts, but it is not the most everyday general-purpose word for all learners.

It is basically a borrowing from English bull or bullseye. Depending on context, Russian speakers might also say:

• яблочко = bullseye, dead center
• центр мишени = the center of the target

So целиться в булл can sound specialized or game-like. A more broadly familiar phrase would often be целиться в яблочко.

Because the first part, Пускай меткость сегодня плохая, functions as a concessive clause: even if accuracy is bad today.

The second part is the main command: продолжай целиться в булл

So the comma separates:

• the concessive idea: even if / granted that...
• the main instruction: keep aiming...

This is similar in logic to English: Even if your accuracy is bad today, keep aiming for the bull.

No, Russian word order is flexible. This sentence can be rearranged without changing the core meaning, though the emphasis shifts a little.

For example:

• Пускай сегодня меткость плохая, продолжай целиться в булл.
• Пускай меткость плохая сегодня, продолжай целиться в булл.

The original Пускай меткость сегодня плохая... sounds natural and keeps меткость as the topic early in the sentence.

It is understandable, but it does have a slightly game/instructional feel, especially because of булл.

A more idiomatic everyday version might be something like: Пусть сегодня меткость подводит, всё равно целься в яблочко.

That said, the original sentence is grammatically workable, and in a sports or game setting it makes sense.